SCHEDULED MAINTENANCE
The stepwise generation of multimetallic complexes based on a vinylbipyridine linkage and their photophysical properties†
Abstract
The versatile rhenium complex [ReCl(CO)3(bpyC![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CH)] (HCCbpy = 5-ethynyl-2,2′-bipyridine) is used to generate a series of bimetallic complexes through the hydrometallation of [MHCl(CO)(BTD)(PPh3)2] (M = Ru, Os; BTD = 2,1,3-benzothiadiazole). The ruthenium complex [Ru{CH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CH-bpyReCl(CO)3}Cl(BTD)(CO)(PPh3)2] was characterised structurally. Ligand exchange reactions with bifunctional linkers bearing oxygen and sulfur donors provide access to tetra- and pentametallic complexes such as [{M{CHCH-bpyReCl(CO)3}(CO)(PPh3)2}2(S2CNC4H8NCS2)] and Fe[C5H4CO2M{CHCH-bpyReCl(CO)3}(CO)(PPh3)2]2. The effect of the group 8 metal on the photophysical properties of the rhenium centre was investigated using the complexes [Ru{CHCH-bpyReCl(CO)3}Cl(BTD)(CO)(PPh3)2] and [M{CHCH-bpyReCl(CO)3}{S2P(OEt)2}(CO)(PPh3)2] (M = Ru, Os). This revealed the quenching of the rhenium-based emission in favour of weak radiative processes based on the Ru and Os centres. The potential for exploiting this effect is illustrated by the reaction of [Ru{CHCH-bpyReCl(CO)3}Cl(CO)(BTD)(PPh3)2] with carbon monoxide, which results in a 5-fold fluorescence enhancement in the dicarbonyl product, [Ru{CHCH-bpyReCl(CO)3}Cl(CO)2(PPh3)2], as the quenching effect is disrupted.
- This article is part of the themed collection: Multimetallic complexes: synthesis and applications
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